Hebrews 5:1-6

5Every high priest chosen from among mortals is put in charge of things pertaining to God on their behalf, to offer gifts and sacrifices for sins.
2He is able to deal gently with the ignorant and wayward, since he himself is subject to weakness;
3and because of this he must offer sacrifice for his own sins as well as for those of the people.
4And one does not presume to take this honor, but takes it only when called by God, just as Aaron was.
5So also Christ did not glorify himself in becoming a high priest, but was appointed by the one who said to him, You are my Son, today I have begotten you;
6as he says also in another place, You are a priest forever, according to the order of Melchizedek.

From the oremus Bible Browser http://bible.oremus.org v2.2.8 14 July 2018.